剑桥英语：CAE（C1高级） - 生物及其行为

an intelligent ape, with mainly black fur, which has no tail and is native to the forests of western and central Africa

(of cats) to make a prolonged low sound as a sign of content

a large wild ox with shaggy coat and long horns that is domesticated in Tibet

a type of bivalve mollusk, living in marine or freshwater environments, often attached to rocks or other surfaces

to make a loud, harsh scream suddenly

(of wild animals) hunting, killing, and feeding on other animals for survival

the action of hiding the identity or presence of something by altering its appearance

(of animals or birds) moving from one place to another, often with the changing seasons

(of animals) protective of a specific area, space, or domain, often showing aggression or vigilance toward intruders

(of plants or animals) feeding on the meat or flesh of other animals

(of an animal) solely feeding on plants

eating both animals and plants

the similarity of one animal species to another species or to elements of its environment, providing camouflage or protection from predators

an animal that eats trash, leftovers, or dead animals

a group of crows gathered together

a large group of rooks or owls that gather together

a nocturnal, burrowing mammal native to Africa, with a long snout and tongue, feeding mainly on ants and termites

a semiaquatic mammal native to eastern Australia, notable for its duck-like bill, webbed feet, and ability to lay eggs

a nocturnal mammal covered in hard, overlapping scales, feeding primarily on ants and termites, and capable of curling into a protective ball

a wild, solitary, strong, and resilient mammal with brown fur and a long tail, typically found in cold regions of northern Eurasia, Europe, and North America

an animal at the top of a food chain that has no natural predators